Ihventok



H. PLANT. nocma FOR coucu AND LIKE ROLLS OF PAPER MAKING MACHINES.

APPUCATION FlLED 0CT.15| 191]- 1 ,3 1 7, 1 O0 Patented Sept. 23, 1919.

I 2 SHEETS-SHEET l.

INVENTORZ- H. PLANT.

S E N H c A M G N K A M on E P A P F 0 S L L 0 R F. K .L D N A H C U 0 CR 0 F on 0 I C 0 D APPLICATION FILED OCT. 5. 191]. 1 ,3 1 7, 1 0OPatented Sept. 23, 1919.

2 SHEElS-SHEET 2- BY HIS flTTOE/YEYJ- HERBERT PLANT, OF BURY, NEAR MANCHESTER, ENGLAND.

DOCTOR FQR COUCH AND LIKE ROLLS OE PAPER-MAKING MACHINES.

Specification of Letters Patent.

Patented Sept. 23, 1919.

Application filed October 16, 1917. Serial No. 196,848.

To all whom it may concern:

Be it known that I, Hnnnnn'r PLANT, a subject of the King of GreatBritain and Ireland, and resident, of Bury, near Manchester, England,have invented certain new and useful Improvements in Doctors. for Couchand like Rolls. of Paper-Making Machines, of which the following is a.specification.

This invention relates to, couch rolls and refers more particularly todoctors for the same. 1

The main object 013 the present invention is to provide a couch rolldoctor, or? like apparatus wherein; particlesof pulp or other matter, orimpuritiemare flushed straight off the roll at right angles to: the sameinto a receiver without any rubbing or scouring effect between the rolland the doctor or in which such rubbing effect is: reduced to a minimumin order to obviate damage to the couch roll jacket.

Another object of the invention is to construct the device so that thearea 0t contact between the doctor and the. roll jacket is reduced tothe minimum while the pressure on the jacket is readily adjustable andmaintained uniform along the'length: of the roll, also so that the jointbetween said roll and the doctor is maintained; constant in use,adjustment being readily effected for this purpose. A still furtherobject of the invention is to construct and arrange the wearing parts ofthe doctor so that they may be readily adjusted or renewed.

According to the invention a spray pipe is arranged above the couchroll, such pipe usually being arranged to lie substantially with in thevertical plane passing through the roll axis and adapted to pro ect aspray of water along the length of the roll in a straight line on theleading side of the same. Along or slightly in advance of this linerests the somewhat knife shaped edge of the doctor board the to of whichis substantially horizontalv or s opes away from the horizontal. Thedoctor board is preferably made of wood or the like material and clampedto the edge of a trough, so that, in use, the spray of water flows inthe direction the roll is rotating on to said roll just in front of theedge of the doctor board and straight forward into the-trough of thedoctor, carrying with it'any particles of matter adhering to the couchroll jacket, the

doctor board acting as a squeegee:

The invention will be more particularly described by the aid of theaccompanying drawings, in which:

Figure 1 is an end view of a couch roll doctor constructed according tothe invention,'and applied to a couch roll.

Fig. 2 is a front view and Fig. 3 is a plan view of Fig. 1, while Fig. 4is a cross-sectional view corresponding to Fig. 1.

Referring to the drawings, a trough a is provided extending the wholelength of the couch roll 6 and having transverse grooves or slots 0formed in the ends thereof the bottom of which are undercut ordovetailed in shape. Within the grooves c and adjustable along thelength of the same are trunnions d, which are secured in the adjustedposition by bolts 6, having heads shaped to fit the before mentioneddovetail slots.

At the forward edge f of the trough a is the doctor board g, secured inposition by the clamping rail h, having clamping screws 2' rotatablymounted therein and screw-wise engaging the trough edge f, the rail h being positioned relatively to said edge by thedowel pins j.

Cross slots 70 are formed in the board {7 extending from the rear edgetoward the front edge and between the before-mentioned cross-slotshorizontal screw pins Z are provided in the back of the clamping rail h,by means of which the front edge of the board 9 can belaterally adjustedlocally to insure perfect contact with the couch roll throughout theentire length, the before mentioned cross slots 70 permitting thenecessary local deflection of the board. I

The end trunnions (Z are journaled in brackets (not shown) secured tothe roll housings andby varying the position of the trunnions along theslot 0, the doctor board 9 is caused to overhang said trunnions to agreater or less extent, thereby altering the degree of pressure withwhich said board rests upon the roll. The board 9 contacts with the rollI) on the leading side near the top, say along a line approximately 30from the vertical plane passing through the axis, and rearwardly of theline of contact a spray pipe m is provided, extending the Whole lengthof the roll. A spray of water is projected from said pipe forwardly inthe direction the roll is rotating and adapted to strike the same alonga line,parallel to ing or loosening the rail h.-

and near to the edge of the board 9, the water then passing straightforward over said board into the trough a carrying with it any particlesof solid matter, an outlet nozzle n being provided in the trough 'con- 7nected by a flexible or other pipe to a suitable receptacle from whichparticles of pulp orthe like-can be recovered. The edge of the board 9acts as asqueegee to scrape the rollj-acket perfectly dry and clean,with a light even pressure which does not damage the-same. V V l Theedge of the boardg can be planed true,-from time to time, to maintain"perfect contact and said'board can be readilyremoved for such truing,or for renewal;pur= poses,by unscrewing the pins 2' and removi Ifdesired suitable gearing maybe provided in order to; oscillate thedoctor but such oscillation is usually not necessary owing to the fineadjustments which can be 7 maintainedand the cleansing stream escapingover the doctor board at right angles I ikto the length of the same.

a It will be obvious that the doctor can be readilyf turned back out ofthe wayrwhen desired, for instance when a jacket is being puton thecouch'roll, and while the lateral position of the trunnions may ,bereadily :altered tolvary the pressure of the doctor board upon. thecouch roll, such alteration is not one that could easily be effected byunauthorized:

persons "without being: ob S rved; .7 7 J #While the preferred'fo rm oftheiinvention has been described it will be understood that the detailconstruction may be varied, the essential feature being that the waterflowing; on to the couch roll is discharged straight forward and not atthe ends of the 'rolls, thus quickly removing any material on the rolland reducing the liability, to score or otherwise injure the roll jacketto a minimum. 1 r 'What I claim is i r r 1. A couch rolldoctorcomprising in combination a pivotally' mounted sweeping "board theoperative edge of'which is adapt- V t ed torest upon the leading side ofthe roll and thetop side of which is arranged at an inclination to thehorizontal" plane such that a stream of water-projected on to the rollcan flow over thesame and means to 1 project a stream of cleansing fluidon to the roll adjacent to said board,'substantially as described. a i

1 '72. A couch roll doctor comprising in combination a pivotally mountedsweeping Y Copies, ot this patent may be obtained for five cents each,by addressing the Washington, D. G. V

inclination to the horizontal plane such that board the operative edgeof v vhich'is adaptf ed to rest upon the leading side of the roll andthe top side of which is arranged at an a stream of water projected onto the roll can flow over the same, means toadjustthe position of thepivots relative to the opera-- tive edge of the board to vary thedegreeof' pressure upon the couch roll, and means to project a stream ofcleansing fluid-on to the roll adjacent to said board, substantially asdescribed. 3 V

8. Couch roll doctorscomprising in combination a'piyotally' mountedtrough, a

sweeping board adjustably' mounted on one side'of said troughiandoneedge of which I V is adapted to rest'upon the couch roll in a lineapproximately 30 in front of the V615 tical planei-passing through theaxis of the same the inclin ation of the top of the sweeping boardpermitting the cleansing j fluid flowing over the same, substantially asdescribed. r

4. Couch roll doctors :comprising in combination a pivota-lly amountedtrough,

grooves in the'end ofthe troughjadjustablo 'trunnions located in saidgrooves,a sweeping board a.djustably mounted on one side of said troughandaone edge of which is adapted to rest upon the couch' rollina line 7approximately 30 in front ofthe vertical plane passing through the axisof tllfljStLHlG the inclination of the 'top'of the sweeping boardpermitting the; cleansingfiuid ing over the same, substantially: as de:

scribed.v I

5. Couch; roll doctors comprising 'in com' bination apivotally-'mountedrtrough,' a

sweeping board-@adjustably mounted on one j;

sideofsaid trough and one edge of which v is adapted to restupon; thecouch'roll'in a cal plane passing throughrthe-axis 'ofthe edge' of theboard substantially I as de "scribed.

6. Couch roll doctorscomprising in combination a pivotally mountedtrough a clamping rail along one edge of said trough, Y v i i a'slottedboard clamped'to the trough by said rail, screwed means. toadjust the board laterally relativelyto' the trough, andmeans to'carrythe cleansing fluid from the trough to a reservoir, substantially .asdescribed:

In witness whereof I have hereunto set my hand inthe presencerof twowitnesses.

V:Witnesses:'- V

Finn), J. MEREDITH, 1 I HY. "JUNCA.

. HERBERT PLAhTTr Gommissioner of Batents,

